scholarly journals Multifunctional and Durable Coatings for Stone Protection Based on Gd-Doped Nanocomposites

2021 ◽  
Vol 13 (19) ◽  
pp. 11033
Author(s):  
Marwa Ben Chobba ◽  
Maduka Lankani Weththimuni ◽  
Mouna Messaoud ◽  
Donatella Sacchi ◽  
Jamel Bouaziz ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Protective Coatings ◽  
Vapour Permeability ◽  
Doped Tio2 ◽  
Molar Ratios ◽  
Historic Structures ◽  
Weak Activity ◽  
Self Cleaning ◽  
The Stability ◽  
First Time

The development of nanocomposite materials with multifunctional protective features is an urgent need in many fields. However, few works have studied the durability of these materials. Even though TiO2 nanoparticles have been extensively applied for self-cleaning effect, it displays a weak activity under visible light. Hence, in this study, pure and Gd-doped TiO2 nanoparticles (molar ratios of doping ions/Ti are 0.1 and 1) were synthesised, characterised, and then mixed with polydimethylsiloxane (PDMS), used as a binder, in order to produce a homogenised thin film on a very porous stone substrate. To our knowledge, Gd-doped TiO2/PDMS protective coatings are studied for the first time for application on historic structures. The protective coatings developed in this work are intended to reduce the surface wettability of the stone and protect the historic stones from dye pollution and microorganism colonisation. Moreover, in this study, the durability of the developed nanocomposite was deeply studied to evaluate the stability of the coatings. Results confirmed that samples treated with the lowest concentrations of Gd ions (0.1 mol%) showed acceptable chromatic variations, a good repellent feature, acceptable water vapour permeability, good durability, the highest self-cleaning activity, and good inhibitory behaviour against microbial colonisation.

Self-cleaning ceramic tiles coated with Nb2O5-doped-TiO2 nanoparticles

2017 ◽  
Vol 43 (15) ◽  
pp. 11986-11991 ◽  
Author(s):  
Andre L. da Silva ◽  
Michele Dondi ◽  
Dachamir Hotza
Keyword(s):  
Tio2 Nanoparticles ◽  
Ceramic Tiles ◽  
Doped Tio2 ◽  
Self Cleaning

Fabrication of Visible Light-Induced Antibacterial and Self-Cleaning Cotton Fabrics Using Manganese Doped TiO2 Nanoparticles

2018 ◽  
Vol 1 (4) ◽  
pp. 1154-1164 ◽  
Author(s):  
Muhammad Zahid ◽  
Evie L. Papadopoulou ◽  
Giulia Suarato ◽  
Vassilios D. Binas ◽  
George Kiriakidis ◽  
...  
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Cotton Fabrics ◽  
Doped Tio2 ◽  
Self Cleaning

Visible Light Active Ce-doped TiO2 Nanoparticles for Photocatalytic Degradation of Methylene Blue

2016 ◽  
Vol 13 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Rani P. Barkul ◽  
Farah-Naaz A. Shaikh ◽  
Sagar D. Delekar ◽  
Meghshyam K. Patil
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Doped Tio2 ◽  
Visible Light Active

Ultrasonic biosynthesis of TiO2 nanoparticles for improved self-cleaning and wettability coating of DBD plasma pre-treated cotton fabric

2021 ◽  
Vol 127 (8) ◽  
Author(s):  
Muhammad Saleem ◽  
Muhammad Yasin Naz ◽  
Shazia Shukrullah ◽  
Shaukat Ali ◽  
Syed Talha Ali Hamdani
Keyword(s):  
Tio2 Nanoparticles ◽  
Cotton Fabric ◽  
Dbd Plasma ◽  
Self Cleaning

scholarly journals Green Synthesis of N/Zr Co-Doped TiO2 for Photocatalytic Degradation of p-Nitrophenol in Wastewater

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 235
Author(s):  
Hayette Benkhennouche-Bouchene ◽  
Julien G. Mahy ◽  
Cédric Wolfs ◽  
Bénédicte Vertruyen ◽  
Dirk Poelman ◽  
...  
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Visible Region ◽  
Chemical Properties ◽  
Pure Tio2 ◽  
Molar Ratio ◽  
Xps Spectra ◽  
Doped Tio2 ◽  
Co Doped

TiO2 prepared by a green aqueous sol–gel peptization process is co-doped with nitrogen and zirconium to improve and extend its photoactivity to the visible region. Two nitrogen precursors are used: urea and triethylamine; zirconium (IV) tert-butoxide is added as a source of zirconia. The N/Ti molar ratio is fixed regardless of the chosen nitrogen precursor while the quantity of zirconia is set to 0.7, 1.4, 2, or 2.8 mol%. The performance and physico-chemical properties of these materials are compared with the commercial Evonik P25 photocatalyst. For all doped and co-doped samples, TiO2 nanoparticles of 4 to 8 nm of size are formed of anatase-brookite phases, with a specific surface area between 125 and 280 m2 g−1 vs. 50 m2 g−1 for the commercial P25 photocatalyst. X-ray photoelectron (XPS) measurements show that nitrogen is incorporated into the TiO2 materials through Ti-O-N bonds allowing light absorption in the visible region. The XPS spectra of the Zr-(co)doped powders show the presence of TiO2-ZrO2 mixed oxide materials. Under visible light, the best co-doped sample gives a degradation of p-nitrophenol (PNP) equal to 70% instead of 25% with pure TiO2 and 10% with P25 under the same conditions. Similarly, the photocatalytic activity improved under UV/visible reaching 95% with the best sample compared to 50% with pure TiO2. This study suggests that N/Zr co-doped TiO2 nanoparticles can be produced in a safe and energy-efficient way while being markedly more active than state-of-the-art photocatalytic materials under visible light.

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